Timepiece-escapement



(No Model 2 Sheets-Sheet 1] J. H. L'ANGHORST. TIMEPIEGB ESOAPBMENT.

No; 504,228. Patented Aug. 29, 1893.

(No Model.)' 2 sheets-sheet J. H. LANGHOR'ST Y TIMEPI EOE ES OAPEMENT.

'No'. 504,223. Patented Aug.- 29, 1893.

UNITED STATES PATENT OFFICE.

JOHN HENRY LANGHORST, OF JACKSON, CALIFORNIA.

TlMEPlECE-ESCAPEMENT.

SPECIFICATION forming part of Letters Patent No. 504,223, dated August29, 1893.

Application filed April 4, 1893. Serial No. 469,017. (No model.)

To all whom it may concern.-

Be it known that I, JOHN HENRY LANG- HORST, a citizen of the UnitedStates, residing at Jackson, Amador county, State of California, haveinvented an Improvement in Anchors for Lever-Escapements for Timepieces;and I hereby declare the following to be a f ull,clear, and exactdescription of the same.

My invention relates to the class of time pieces, and particularly tothe class of anchors for detached lever esoapements for Watches, clocksand time pieces generally.

My invention consists in the novel construction of the acting faces ofthe receiving and leaving pallets of the anchor, as I shall hereinafterfully describe and specifically claim.

The object of my invention will hereinafter fully appear.

Referring to the accompanying drawings for a more complete explanationof my invention,-Figure l is a side elevation of a lever escapement inwhich the escape wheel is of the type known as ratchet wheel. Fig. 2 isa side elevation in which the escape wheel is of the type known as clubwheel. In both figures my improved anchor is shown.

A is the anchor having a receiving or entering palletE and a leavingpallet L. These pallets may be formed integral with the anchor, as shownin Fig. 1, or may be separate pieces inserted therein, as shown in Fig.2, both of which constructions are usual.

The acting face of the receiving or entering pallet is represented bythe line a-b, and it will be seen that this is a convex curve.

The acting face of the leaving pallet L is represented by c--d and this,it will be seen, is a straight line.

C is the escape wheel.

It can be demonstrated that the allied impulse and resistance in anchormotion caused by the hair spring power is not equal on the entering andleaving pallet. The impulse of the hair spring acts during the firsthalf of each impulse, and is greatest at the entering points a. c, andis least at the middle of the acting faces of the pallets. Theresistance of the hair spring acts during the latter half of eachimpulse, being greatest at the leaving points I), d, and least at themiddle of each pallet.

It can also be demonstrated that the force of momentum of the runningpower, transmitted by the escape wheel to the anchor pallets, isgreatest at the point a of the entering pallet, and the point d of theleaving pallet, and is least at the point b of the entering pallet, andthe point 0 of the leaving pallet, and this is on account of thedifferent length of radii; that is the outer and inner radius of anchorpallet from center. It follows that at the point a on the enteringpallet E, the greatest momentum of the running power is allied with thelargest hair spring power, and that at the point I), the smallestmomentum of force is allied to the larger hair-spring resistance, whichcauses an unfavorable, uneven impulse. On the other hand, on the leavingpallet at c, the smaller momentum of force of the running power isallied with the larger hair spring power, and at d the larger momentumof force of the running power is allied with the larger resistance ofthe hair spring power which causes a favorable and even impulse. I,therefore, change the incline of the pallet face on the entering palletE to a convex curve, as shown,which permits more anchor motion duringthe first half of the impulse, and allows less anchor motion during thelatter half of the impulse. The impulse power lostat the first half ofthe impulse is gained at the latter half, thereby approximatelyequalizing the impulse on the entering pallet E and on the leavingpallet L.

The construction which I have herein shown permits another advantagewhen the club Wheel, as shown in Fig. 2,is used; that is the incline onthe wheel tooth can be given the proper proportion, without the faces ofthe wheel teeth being chafed or gouged by the entering-pallet corner ata. On the leaving pallet corner at o, the wheel teeth have ampleclearance. I, therefore, bring the convex pallet face a-b approximatelyto the same condition as the straight pallet face cd of the leavingpallet, with respect to the angle of incline of pallet face with itsrespective tangents of the wheel circle. This improved construction ofthe anchor, when used with the pallet is a convex curve, and the actingline 15 for impulse on the leaving pallet is a straight line, wherebythe lifting power transmitted by the escape wheel is approximately thesame on the entering or receiving pallet and on the leaving pallet,substantially as herein :0 described.

In witness whereof I have hereunto set my hand.

JOHN HENRY LANGI-IORST.

Witnesses:

I. B. GOLDNER, G. A. WALTENsPIEL.

